GB8628609D0 - Lubricating oil additives - Google Patents

Lubricating oil additives

Info

Publication number
GB8628609D0
GB8628609D0 GB868628609A GB8628609A GB8628609D0 GB 8628609 D0 GB8628609 D0 GB 8628609D0 GB 868628609 A GB868628609 A GB 868628609A GB 8628609 A GB8628609 A GB 8628609A GB 8628609 D0 GB8628609 D0 GB 8628609D0
Authority
GB
United Kingdom
Prior art keywords
lubricating oil
composition
incorporation
anhydride
ester
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB868628609A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lubrizol Adibis Holdings UK Ltd
Original Assignee
BP Chemicals Additives Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10608200&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB8628609(D0) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to GB868628609A priority Critical patent/GB8628609D0/en
Application filed by BP Chemicals Additives Ltd filed Critical BP Chemicals Additives Ltd
Publication of GB8628609D0 publication Critical patent/GB8628609D0/en
Priority to KR1019880700896A priority patent/KR960010992B1/ko
Priority to BR8707551A priority patent/BR8707551A/pt
Priority to ES87310461T priority patent/ES2051752T3/es
Priority to JP62507102A priority patent/JPH0631383B2/ja
Priority to ES87310460T priority patent/ES2051751T3/es
Priority to BR8707550A priority patent/BR8707550A/pt
Priority to PCT/GB1987/000847 priority patent/WO1988003944A1/en
Priority to DE3781118T priority patent/DE3781118T3/de
Priority to AU82380/87A priority patent/AU608792B2/en
Priority to EP87310461A priority patent/EP0273588B2/en
Priority to EP87310460A priority patent/EP0271262B2/en
Priority to AT87310461T priority patent/ATE79396T1/de
Priority to PCT/GB1987/000848 priority patent/WO1988003945A1/en
Priority to KR1019880700889A priority patent/KR960010991B1/ko
Priority to JP62507103A priority patent/JPH0631384B2/ja
Priority to AU82372/87A priority patent/AU609075B2/en
Priority to AT87310460T priority patent/ATE79395T1/de
Priority to DE3781126T priority patent/DE3781126T3/de
Priority to ZA878939A priority patent/ZA878939B/xx
Priority to CA000552952A priority patent/CA1305696C/en
Priority to ZA878938A priority patent/ZA878938B/xx
Priority to CA000552953A priority patent/CA1305697C/en
Priority to CN87108239A priority patent/CN1015642B/zh
Priority to CN87108344A priority patent/CN1012074B/zh
Priority to MX009636A priority patent/MX169105B/es
Priority to IN1019DE1987 priority patent/IN172581B/en
Priority to IN1018/DEL/87A priority patent/IN169547B/en
Priority to MX009654A priority patent/MX169106B/es
Priority to FI883503A priority patent/FI93654C/fi
Priority to FI883502A priority patent/FI93653C/fi
Priority to DK198804198A priority patent/DK175287B1/da
Priority to DK419788A priority patent/DK419788D0/da
Priority to NO883348A priority patent/NO302763B1/no
Priority to NO883349A priority patent/NO176147C/no
Priority to IN1225DE1990 priority patent/IN176479B/en
Priority to IN1230DE1990 priority patent/IN178991B/en
Priority to SG1010/92A priority patent/SG101092G/en
Priority to SG1011/92A priority patent/SG101192G/en
Priority to GR920402404T priority patent/GR3006075T3/el
Priority to GR920402433T priority patent/GR3006112T3/el
Priority to US08/339,650 priority patent/US5714443A/en
Priority to US08/410,758 priority patent/US5716914A/en
Priority to US08/991,547 priority patent/US6090760A/en
Priority to US08/991,546 priority patent/US6090759A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12—Reaction products
    • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
    • C10M159/22—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
GB868628609A 1986-11-29 1986-11-29 Lubricating oil additives Pending GB8628609D0 (en)

Priority Applications (45)

Application Number Priority Date Filing Date Title
GB868628609A GB8628609D0 (en) 1986-11-29 1986-11-29 Lubricating oil additives
AT87310460T ATE79395T1 (de) 1986-11-29 1987-11-26 Erdalkalimetallalkylphenolate, ihre geschwefelten derivate, ihre herstellung und ihre verwendung.
DE3781126T DE3781126T3 (de) 1986-11-29 1987-11-26 Geschwefelt Erdalkalimetallalkylphenolate, ihre Herstellung und ihre Verwendung.
AU82380/87A AU608792B2 (en) 1986-11-29 1987-11-26 Sulphurised alkaline earth metal hydrocarbyl phenates, the production and use thereof
AT87310461T ATE79396T1 (de) 1986-11-29 1987-11-26 Geschwefelt erdalkalimetallalkylphenolate, ihre herstellung und ihre verwendung.
ES87310461T ES2051752T3 (es) 1986-11-29 1987-11-26 Hidrocarbilfenatos de metales alcalinoterreos sulfurizados, su produccion y uso de los mismos.
JP62507102A JPH0631383B2 (ja) 1986-11-29 1987-11-26 アルカリ土類金属ハイドロカービルフェネート類、それらの硫化誘導体、それらの製造及びそれらの使用
ES87310460T ES2051751T3 (es) 1986-11-29 1987-11-26 Hidrocarbilfenatos de metales alcalinoterreos, sus derivados sulfurizados, su produccion y uso de los mismos.
BR8707550A BR8707550A (pt) 1986-11-29 1987-11-26 Concentrado de aditivo adequado para incorporacao a uma composicao de oleo lubrificante acabada,processo para sua producao,e composicao de oleo lubrificante acabada
PCT/GB1987/000847 WO1988003944A1 (en) 1986-11-29 1987-11-26 Alkaline earth metal hydrocarbyl phenates, their sulphurised derivatives, their production and use thereof
DE3781118T DE3781118T3 (de) 1986-11-29 1987-11-26 Erdalkalimetallalkylphenolate, ihre geschwefelten Derivate, ihre Herstellung und ihre Verwendung.
KR1019880700896A KR960010992B1 (ko) 1986-11-29 1987-11-26 알카리 토금속 하이드로카빌 페네이트 및 이의 황화 유도체를 포함하는 첨가 농축물, 이의 제조방법 및 이를 포함하는 가공 윤활유 조성물
EP87310461A EP0273588B2 (en) 1986-11-29 1987-11-26 Sulphurised alkaline earth metal hydrocarbyl phenates, their production and use thereof
EP87310460A EP0271262B2 (en) 1986-11-29 1987-11-26 Alkaline earth metal hydrocarbyl phenates, their sulphurised derivatives, their production and use thereof
BR8707551A BR8707551A (pt) 1986-11-29 1987-11-26 Concentrado de aditivo adequado para incorporacao em um oleo lubrificante acabado,processo para sua producao e composicao de oleo lubrificante acabada
PCT/GB1987/000848 WO1988003945A1 (en) 1986-11-29 1987-11-26 Sulphurised alkaline earth metal hydrocarbyl phenates, their production and use thereof
KR1019880700889A KR960010991B1 (ko) 1986-11-29 1987-11-26 황화 알칼리 토금속 하이드로카빌 페네이트, 이의 제조방법 및 이를 포함하는 가공 윤활유 조성물
JP62507103A JPH0631384B2 (ja) 1986-11-29 1987-11-26 硫化アルカリ土類金属ヒドロカルビルフェノラートを含有する添加剤コンセントレートの製造方法
AU82372/87A AU609075B2 (en) 1986-11-29 1987-11-26 Alkaline earth metal hydrocarbyl phenates, their sulphurised derivatives, their production and use thereof
CA000552953A CA1305697C (en) 1986-11-29 1987-11-27 Sulphurised alkaline earth metal hydrocarbyl phenates, their production and use thereof
ZA878938A ZA878938B (en) 1986-11-29 1987-11-27 Alkaline earth metal hydrocarbyl phenates,their sulphurised derivatives,their production and use thereof
ZA878939A ZA878939B (en) 1986-11-29 1987-11-27 Sulphurised alkaline earth metal hydrocarbyl phenates,their production and use thereof
CA000552952A CA1305696C (en) 1986-11-29 1987-11-27 Alkaline earth metal hydrocarbyl phenates, their sulphurised derivatives, their production and use thereof
CN87108239A CN1015642B (zh) 1986-11-29 1987-11-29 碱土金属烃基酚盐及其磁化衍生物，它们的制备和应用
CN87108344A CN1012074B (zh) 1986-11-29 1987-11-29 硫化烃基酚碱土金属盐添加剂浓缩物的生产方法
MX009636A MX169105B (es) 1986-11-29 1987-11-30 Fenatos de hidrocarbilo de metal alcalinoterreo sulfurizados, su produccion y el uso de los mismos
MX009654A MX169106B (es) 1986-11-29 1987-11-30 Hidrocarbilfenatos de metal alcalinoterreo, sus derivados sulfurados, su produccion y el uso de los mismos
IN1019DE1987 IN172581B (ko) 1986-11-29 1987-11-30
IN1018/DEL/87A IN169547B (ko) 1986-11-29 1987-11-30
FI883503A FI93654C (fi) 1986-11-29 1988-07-25 Rikitettyjä maa-alkalimetallihydrokarbyylifenaatteja, niiden valmistus ja niiden käyttö
FI883502A FI93653C (fi) 1986-11-29 1988-07-25 Maa-alkalimetallihydrokarbyylifenaatteja, niiden rikitettyjä johdannaisia, niiden valmistus ja niiden käyttö
DK198804198A DK175287B1 (da) 1986-11-29 1988-07-27 Sulfurerede jordalkalimetalhydrocarbylphenater, deres fremstilling og anvendelse
DK419788A DK419788D0 (da) 1986-11-29 1988-07-27 Jordalkalimetalhydrocarbylphenater, deres sulfurerede derivater, deres fremstilling og anvendelse
NO883348A NO302763B1 (no) 1986-11-29 1988-07-28 Additivkonsentrat egnet for inkorporering i en smöreolje, og fremgangsmåte for fremstilling derav
NO883349A NO176147C (no) 1986-11-29 1988-07-28 Fremgangsmåte for fremstilling av et additivkonsentrat egnet for inkorporering i smöreolje
IN1225DE1990 IN176479B (ko) 1986-11-29 1990-12-04
IN1230DE1990 IN178991B (ko) 1986-11-29 1990-12-05
SG1011/92A SG101192G (en) 1986-11-29 1992-10-05 Alkaline earth metal hydrocarbyl phenates,their sulphurised derivatives,their production and use thereof
SG1010/92A SG101092G (en) 1986-11-29 1992-10-05 Sulphurised alkaline earth metal hydrocarbyl phenates,their production and use thereof
GR920402404T GR3006075T3 (ko) 1986-11-29 1992-10-26
GR920402433T GR3006112T3 (ko) 1986-11-29 1992-10-29
US08/339,650 US5714443A (en) 1986-11-29 1994-11-14 Sulphurised alkaline earth metal hydrocarbyl phenates, their production and use thereof
US08/410,758 US5716914A (en) 1986-11-29 1995-03-27 Alkaline earth metal hydrocarbyl phenates, their sulphurized derivatives, their production and use thereof
US08/991,547 US6090760A (en) 1986-11-29 1997-12-16 Sulphurized alkaline earth metal hydrocarbyl phenates, their production and use thereof
US08/991,546 US6090759A (en) 1986-11-29 1997-12-16 Alkaline earth metal hydrocarbyl phenates, their sulphurized derivatives, their production and use thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868628609A GB8628609D0 (en) 1986-11-29 1986-11-29 Lubricating oil additives

Publications (1)

Publication Number Publication Date
GB8628609D0 true GB8628609D0 (en) 1987-01-07

Family

ID=10608200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB868628609A Pending GB8628609D0 (en) 1986-11-29 1986-11-29 Lubricating oil additives

Country Status (20)

Country Link
EP (2) EP0273588B2 (ko)
JP (2) JPH0631384B2 (ko)
KR (2) KR960010991B1 (ko)
CN (2) CN1012074B (ko)
AT (2) ATE79395T1 (ko)
AU (2) AU609075B2 (ko)
BR (2) BR8707551A (ko)
CA (2) CA1305696C (ko)
DE (2) DE3781126T3 (ko)
DK (2) DK175287B1 (ko)
ES (2) ES2051752T3 (ko)
FI (2) FI93653C (ko)
GB (1) GB8628609D0 (ko)
GR (2) GR3006075T3 (ko)
IN (2) IN172581B (ko)
MX (2) MX169105B (ko)
NO (2) NO302763B1 (ko)
SG (2) SG101092G (ko)
WO (2) WO1988003944A1 (ko)
ZA (2) ZA878938B (ko)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8628609D0 (en) * 1986-11-29 1987-01-07 Bp Chemicals Additives Lubricating oil additives
GB8814012D0 (en) * 1988-06-14 1988-07-20 Bp Chemicals Additives Chemical process
GB8814009D0 (en) * 1988-06-14 1988-07-20 Bp Chemicals Additives Lubricating oil additives
GB8814010D0 (en) * 1988-06-14 1988-07-20 Bp Chemicals Addivites Ltd Lubricating oil additives
GB8814008D0 (en) * 1988-06-14 1988-07-20 Bp Chemicals Additives Lubricating oil additives
GB8814013D0 (en) * 1988-06-14 1988-07-20 Bp Chemicals Additives Chemical process
EP0385616B1 (en) * 1989-02-25 1994-06-01 Bp Chemicals (Additives) Limited A process for the production of a lubricating oil additive concentrate
GB8917094D0 (en) * 1989-07-26 1989-09-13 Bp Chemicals Additives Chemical process
US5366648A (en) * 1990-02-23 1994-11-22 The Lubrizol Corporation Functional fluids useful at high temperatures
GB9213723D0 (en) * 1992-06-27 1992-08-12 Bp Chemicals Additives Process for the production of lubricating oil additives
JP2737096B2 (ja) * 1993-08-25 1998-04-08 株式会社コスモ総合研究所 過塩基性硫化アルカリ土類金属フェネートの製造法
TW277057B (ko) * 1993-08-25 1996-06-01 Cosmo Sogo Kenkyusho Kk
GB9318810D0 (en) * 1993-09-10 1993-10-27 Bp Chem Int Ltd Lubricating oil additives
GB9325132D0 (en) * 1993-12-08 1994-02-09 Bp Chemicals Additives Lubricating oil additives
GB9400417D0 (en) * 1994-01-11 1994-03-09 Bp Chemicals Additives Lubricating oil composition
US6008166A (en) * 1994-01-11 1999-12-28 Lubrizol Adibis Holdings Limited Detergent compositions
GB9400415D0 (en) * 1994-01-11 1994-03-09 Bp Chemicals Additives Detergent compositions
GB9411093D0 (en) * 1994-06-03 1994-07-27 Bp Chemicals Additives Detergent additives for lubricating oils, their preparation and use
US5529705A (en) * 1995-03-17 1996-06-25 Chevron Chemical Company Methods for preparing normal and overbased phenates
CA2183906A1 (en) * 1995-08-23 1997-02-24 Christopher S. Fridia Production of low fine sediment high tbn phenate stearate
EP0778336A1 (en) * 1995-12-08 1997-06-11 Cosmo Research Institute Petroleum additive having excellent storage stability and heat stability comprising an alkaline earth metal salt of aromatic hydroxycarboxylic acid or a sulfurized mixture thereof.
GB9611316D0 (en) * 1996-05-31 1996-08-07 Exxon Chemical Patents Inc Overbased metal-containing detergents
GB9611317D0 (en) 1996-05-31 1996-08-07 Exxon Chemical Patents Inc Overbased metal-containing detergents
GB9611424D0 (en) * 1996-05-31 1996-08-07 Exxon Chemical Patents Inc Overbased metal-containing detergents
US5728657A (en) * 1996-08-20 1998-03-17 Chevron Chemical Company Production of low fine sediment high TBN phenate stearate
EP0989178A4 (en) * 1997-05-07 2000-09-13 Cosmo Sogo Kenkyusho Kk LUBRICATING OIL COMPOSITION, HYPERBASIC ALKALINE EARTH METAL SULFIDE PHENATE CONCENTRATE FOR USE IN THE PREPARATION OF THIS COMPOSITION AND PROCESS FOR PREPARING THE CONCENTRATE
US5942476A (en) * 1998-06-03 1999-08-24 Chevron Chemical Company Low-viscosity highly overbased phenate-carboxylate
US6348438B1 (en) 1999-06-03 2002-02-19 Chevron Oronite S.A. Production of high BN alkaline earth metal single-aromatic ring hydrocarbyl salicylate-carboxylate
EP1710294B1 (en) 2005-04-06 2013-03-06 Infineum International Limited A method of improving the stability or compatibility of a detergent
EP1743933B1 (en) 2005-07-14 2019-10-09 Infineum International Limited A use to improve the compatibility of an overbased detergent with friction modifiers in a lubricating oil composition
US20080153723A1 (en) 2006-12-20 2008-06-26 Chevron Oronite Company Llc Diesel cylinder lubricant oil composition
CN102575185B (zh) 2009-08-06 2014-03-05 卢布里佐尔公司 含沥青质分散剂的润滑组合物
CA2782212A1 (en) 2009-11-30 2011-06-03 The Lubrizol Corporation Methods of controlling sulfur trioxide levels in internal combustion engines
US9528067B2 (en) 2009-11-30 2016-12-27 The Lubrizol Corporation Stabilized blends containing friction modifiers
US9163196B2 (en) 2009-11-30 2015-10-20 The Lubrizol Corporation Stabilized blends containing friction modifiers
CN103370402B (zh) 2010-12-21 2016-04-06 路博润公司 含清净剂的润滑组合物
WO2012109311A2 (en) 2011-02-09 2012-08-16 The Lubrizol Corporation Asphaltene dispersant containing lubricating compositions
WO2012112658A1 (en) 2011-02-17 2012-08-23 The Lubrzol Corporation Lubricants with good tbn retention
DK2607462T3 (da) 2011-12-20 2014-03-31 Infineum Int Ltd Smøring af skibsmotor
US9617496B2 (en) * 2012-02-08 2017-04-11 The Lubrizol Corporation Method for preparing a sulfurized alkaline earth metal dodecylphenate
EP2674474B1 (en) * 2012-06-13 2015-09-09 Infineum International Limited Phenate detergent preparation
DK2986694T3 (da) 2013-04-17 2020-03-30 Lubrizol Corp Fremgangsmåde til smøring af cylinder og stempel i en intern to-taktsforbrændingsmotor
JP6618481B2 (ja) * 2014-04-02 2019-12-11 フランク ナタリ ドープト希土類窒化物材料および同材料を含むデバイス

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US4328111A (en) * 1978-11-20 1982-05-04 Standard Oil Company (Indiana) Modified overbased sulfonates and phenates
EP0094814B1 (en) * 1982-05-14 1989-04-19 Exxon Research And Engineering Company Lubricating oil additives
CA1246615A (en) * 1982-05-22 1988-12-13 Charles Cane Process for the production of alkaline earth metal alkyl phenates
ZA833532B (en) * 1982-05-22 1984-12-24 Orobis Ltd Process for the production of either an alkaline earth metal alkyl phenate or a sulphurised alkaline earth metal alkyl phenate
FR2549080B1 (fr) * 1983-07-11 1986-04-04 Orogil Procede de preparation d'additifs detergents-dispersants de tres haute alcalinite a base de calcium et additifs detergents-dispersants pour huiles lubrifiantes ainsi obtenus
GB8628609D0 (en) * 1986-11-29 1987-01-07 Bp Chemicals Additives Lubricating oil additives

Also Published As

Publication number Publication date
CN87108239A (zh) 1988-06-15
CA1305696C (en) 1992-07-28
SG101092G (en) 1992-12-04
FI883503A0 (fi) 1988-07-25
ES2051751T3 (es) 1994-07-01
EP0273588B2 (en) 2001-03-28
DE3781118D1 (de) 1992-09-17
NO883348L (no) 1988-09-14
CN87108344A (zh) 1988-06-22
FI93654C (fi) 1995-05-10
DE3781118T2 (de) 1992-12-17
DK419888D0 (da) 1988-07-27
IN172581B (ko) 1993-10-16
JPH0631384B2 (ja) 1994-04-27
ZA878939B (en) 1989-07-26
IN169547B (ko) 1991-11-09
DE3781126T3 (de) 2001-08-02
DK419788A (da) 1988-07-27
CA1305697C (en) 1992-07-28
FI883502A0 (fi) 1988-07-25
FI883502A (fi) 1988-07-25
EP0271262B2 (en) 2002-05-29
FI93653C (fi) 1995-05-10
KR960010992B1 (ko) 1996-08-14
BR8707551A (pt) 1989-03-14
DK419788D0 (da) 1988-07-27
NO883349L (no) 1988-09-22
ZA878938B (en) 1989-07-26
CN1015642B (zh) 1992-02-26
MX169106B (es) 1993-06-22
FI93653B (fi) 1995-01-31
EP0273588A1 (en) 1988-07-06
AU8237287A (en) 1988-06-16
WO1988003944A1 (en) 1988-06-02
FI93654B (fi) 1995-01-31
MX169105B (es) 1993-06-22
ATE79395T1 (de) 1992-08-15
KR890700159A (ko) 1989-03-10
FI883503A (fi) 1988-07-25
NO176147C (no) 1995-02-08
AU609075B2 (en) 1991-04-26
NO176147B (no) 1994-10-31
SG101192G (en) 1992-12-04
EP0271262B1 (en) 1992-08-12
DE3781126T2 (de) 1993-03-04
JPH01501400A (ja) 1989-05-18
ES2051752T3 (es) 1994-07-01
DK419888A (da) 1988-07-27
NO302763B1 (no) 1998-04-20
NO883348D0 (no) 1988-07-28
KR960010991B1 (ko) 1996-08-14
BR8707550A (pt) 1989-03-14
GR3006112T3 (ko) 1993-06-21
KR890700158A (ko) 1989-03-10
AU608792B2 (en) 1991-04-18
NO883349D0 (no) 1988-07-28
CN1012074B (zh) 1991-03-20
AU8238087A (en) 1988-06-16
JPH0631383B2 (ja) 1994-04-27
GR3006075T3 (ko) 1993-06-21
EP0271262A1 (en) 1988-06-15
ATE79396T1 (de) 1992-08-15
DE3781118T3 (de) 2002-08-14
JPH01501399A (ja) 1989-05-18
DE3781126D1 (de) 1992-09-17
DK175287B1 (da) 2004-08-09
WO1988003945A1 (en) 1988-06-02
EP0273588B1 (en) 1992-08-12

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